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在高速钢热处理过程中,回火是一个重要的工序,一般多采用560℃;对P18进行三次,每次2小时,对P9进行两次,每次2小时。最近我們試驗成功高速钢快速回火方法,縮短了回火次数和时間。这种方法在实际使用中,深得工人同志的好评。快速回火的工艺如下。 P18——温度600℃,爐子是ПН—31爐;第一次保温1小时,第二次保温半小时,回火两次,总共需要1个半小时。 P9——温度520℃,爐子同上;第一次保温1小时,第二次保温半小时,回火两次,总共需要一个半小时。
In the high-speed steel heat treatment process, tempering is an important process, the general use of more 560 ℃; P18 for three times, each 2 hours, P9 twice, each 2 hours. Recently, we successfully tested high-speed steel rapid tempering method, reducing the number and time of tempering. This method is highly praised by the workers’ comrades in actual use. Rapid tempering process is as follows. P18 - temperature 600 ℃, the furnace is ПН-31 furnace; the first heat for 1 hour, the second half-hour heat, tempered twice, a total of 1 and a half hours. P9 - temperature 520 ℃, the same stove; the first one hour incubation, the second half-hour insulation, tempering twice, a total of one and a half hours.